Oy
That could mean so many things if applied to Oswald.
  "his head look flat in back" |
  "his hairline sort of went square" |
John Mytton proposed the jacket collar at the nape cropped off from view the hairline to make it appear trimmed.

Yer desperately grasping at flimsy nonsense, Mr O.....
Or you have trouble understanding what Benevides said.... I believe it's the former, and you know full well that Benavides was NOT describing Lee Oswald's head or hair cut....